SIP in higher education

[Steve Blair <>]

Dennis:

 A bit OT but ... Is this the configuration you use with your SER proxy?
If so do your IP phone users have the ability to do extension dialing
between themselves and/or other on campus non-IP phones? If they
do how many digits are in your extensions and how did you implement
this in SER?

Thanks,Steve

Dennis Baron wrote:

> > I did try do it as you suggest, but I confirmed this doesn't work in 
> > the newer firmware versions (P0S3-06-3-00, P003-07-3-00).  
> > "Proxy*_address" on each line is not actually the sip proxy server 
> > address, it is the domain.
> >    
>
> Exactly.  This is a typical problem of vendors using confusing names
> in their configuration schemes... at least they confuse me.  Here's
> what we have working on a Cisco 79xx - we're running 5.1.0 (shame on
> us!).
>
>         domain_name : mit.edu
>         image_version : "P0S3-05-1-00"
>         FirmLoadID : "PC030301"
>         phone_label : "617-324-8903 "
>         
>         line1_name : "6173248903"
>         line1_authname : 
> ""
>         line1_password : **********
>         line1_shortname : "48903"
>         line1_displayname : "MIT SIP Lab Cisco 7940"
>         proxy1_address : "mit.edu"
>         
>         proxy_register : 1
>         proxy_backup : "18.7.21.118"
>         proxy_emergency : "18.7.21.118"
>         outbound_proxy : 18.7.21.118
>
> So I think all the *1_* fields are associated with the SIP account
> assigned to "Line 1" - ie. "proxy1_address" is really "line1_domain" -
> confusing!  So the SIP URI for Line 1 is made up of
> line1_name@proxy1_address
>  - ie. 
> sip:
>  .  So you'd see
> something like:
>
>     From: "MIT SIP Lab Cisco 7940" 
> <sip:>
>
> I'll guess at the last three lines above - that all SIP requests are
> sent to "outbound_proxy"; with "proxy_backup" as a fallback; and
> unless "proxy_emergency" is matched in the phones dial plan.  You
> should be able to leave these blank and let the phone use DNS to
> determine where to send the requests - but I don't know if Cisco
> allows that?  You also should be able to enter a FQDN in these fields
> and use DNS to specify the list of proxy addresses - but I don't know
> if Cisco supports that either?
>
> Hope this helps.  If anybody thinks I've got this wrong speak up -
> it's been a while since I've played with a Cisco phone!
>
>                   Dennis
>
> =========================================================================
>
> Dennis Baron; Information Services & Technology     
> mailto:
> Senior Strategist for Integrated Communications        
> sip:
> Massachusetts Institute of Technology; Room E19-738   tel:+1-617-252-1232
> 77 Massachusetts Avenue;  Cambridge, MA  02139-4307   fax:+1-617-253-8000
>
> =========================================================================
>
>  

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